/*
;    Project:       Open Vehicle Monitor System
;    Date:          14th March 2017
;
;    Changes:
;    1.0  Initial release
;
;    (C) 2011       Michael Stegen / Stegen Electronics
;    (C) 2011-2017  Mark Webb-Johnson
;    (C) 2011        Sonny Chen @ EPRO/DX
;
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
; THE SOFTWARE.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ovms_log.h>
#include "log_buffers.h"


LogBuffers::LogBuffers() : m_refcount(0)
  {
  }

LogBuffers::~LogBuffers()
  {
  // Free all the buffers in the list.
  for (iterator itr = begin(); itr != end(); ++itr)
    {
    free(*itr);
    }
  }

int LogBuffers::append(const char* fmt, va_list args)
  {
  char *buffer;
  int ret = vasprintf(&buffer, fmt, args);
  if (ret >= 0)
    append(buffer);
  return ret;
  }

void LogBuffers::append(char* buffer)
  {  
  if (empty())
    {
    push_front(buffer);
    }
  else
    {
    iterator before = begin(), after;
    while (true)
      {
      after = before;
      ++after;
      if (after == end())
        break;
      before = after;
      }
    insert_after(before, buffer);
    }
  }

void LogBuffers::set(int count)
  {
  m_refcount = count;
  }

void LogBuffers::release()
  {
  int before = std::atomic_fetch_add(&m_refcount, -1);
  if (before == 1)
    delete this;
  }

bool LogBuffers::last()
  {
  return m_refcount == 1;
  }